Find effective thermal resistance between $A$ & $B$ of cube made up of $12$ rods of same dimensions and shown given thermal conductivity. [ $l =$ length of rod, $a =$ cross section area of rod]
Find effective thermal resistance between $A$ & $B$ of cube made up of $12$ rods of same dimensions and shown given thermal conductivity. [ $l =$ length of rod, $a =$ cross section area of rod]
- A
$\frac{l}{{ka}}$
- B
$\frac{2l}{{ka}}$
- C
$\frac{4l}{{7ka}}$
- D
$\frac{l}{{2ka}}$
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